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authorErez Zadok <ezk@cs.sunysb.edu>2009-12-03 13:35:27 -0500
committerTyler Hicks <tyhicks@linux.vnet.ibm.com>2010-01-19 22:32:54 -0600
commite27759d7a333d1f25d628c4f7caf845c51be51c2 (patch)
tree6181c5f5abe8b2e4b7bdc45f1231c769cc57a403 /fs/ecryptfs
parent38e3eaeedcac75360af8a92e7b66956ec4f334e5 (diff)
ecryptfs: initialize private persistent file before dereferencing pointer
Ecryptfs_open dereferences a pointer to the private lower file (the one stored in the ecryptfs inode), without checking if the pointer is NULL. Right afterward, it initializes that pointer if it is NULL. Swap order of statements to first initialize. Bug discovered by Duckjin Kang. Signed-off-by: Duckjin Kang <fromdj2k@gmail.com> Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu> Cc: Dustin Kirkland <kirkland@canonical.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <stable@kernel.org> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Diffstat (limited to 'fs/ecryptfs')
-rw-r--r--fs/ecryptfs/file.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index 3efc7fdc3c3..dde7bb48bb5 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -191,13 +191,6 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
| ECRYPTFS_ENCRYPTED);
}
mutex_unlock(&crypt_stat->cs_mutex);
- if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
- && !(file->f_flags & O_RDONLY)) {
- rc = -EPERM;
- printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
- "file must hence be opened RO\n", __func__);
- goto out;
- }
if (!ecryptfs_inode_to_private(inode)->lower_file) {
rc = ecryptfs_init_persistent_file(ecryptfs_dentry);
if (rc) {
@@ -208,6 +201,13 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
goto out;
}
}
+ if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
+ && !(file->f_flags & O_RDONLY)) {
+ rc = -EPERM;
+ printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
+ "file must hence be opened RO\n", __func__);
+ goto out;
+ }
ecryptfs_set_file_lower(
file, ecryptfs_inode_to_private(inode)->lower_file);
if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {